2019/4/19 15:11:32 来源： 深圳长欣自动化设备有限公司
为了保证互为冗余的两个卡件具有平等获取外部信息（I/O通讯、网络通讯）的权利，冗余部件具有同样的通讯接口，保证卡件内输入信息的一致。冗余的两块卡件有各自的通讯通路，只要保证相同的输入信息在两个通信通路上同时进行传输，两块卡件就可以获得相同的信息。这种凭借外部设备实现输入信息的同步称为“自然同步”。“自然同步”发生在冗余系统和外部设备之间。工作卡掌握主动权，代表整体发言，并通过冗余通信将各种状态信息传送给备用卡，达到控制任务的同步，这就是“强制同步”。“强制同步”通过冗余通信使备用卡内部控制状态与工作卡保持一致，它发生在互为冗余的卡件之间。根据变量特性的不同，具体采用的同步方式也各不相同.
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GIDDINGS & LEWIS PIC900 TURBO CPU MODULE 502-03814-60R1
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Electro-Craft, Reliance Electric, Allen Bradley DDM-020
NEW Giddings & Lewis NSM2304 M.1015.649 Servo Motor
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Electro-Craft, Reliance Electric, Allen Bradley DDM-010
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Giddings & Lewis Winslow Exatamatic Drill Grinder
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Giddings and Lewis 572-02771-50 Analog nterface Board
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FACE PLATE DRIVE GEAR FOR GIDDINGS & LE11
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